Cashmere colored spun yarn with gradient structure with fluffy inside and soft outside, preparation method of cashmere colored spun yarn and fabric

Abstract

The invention belongs to the technical field of spinning, and particularly relates to cashmere colored spun yarn of an inner-fluffy and outer-soft gradient structure, a preparation method of the cashmere colored spun yarn and fabric. The method comprises the steps that cashmere and water-soluble fibers are prepared into rough yarn A through the steps of opening picking, cotton carding, drawing and roving, then the rough yarn A is twisted and spun, and heavy-twist single yarn is obtained; twisting and spinning by taking the heavy twist single yarns as core yarns and roving B prepared from cashmere as wrap yarns to obtain a product; and the twisting directions of the two twisted yarns are opposite. The water-soluble fiber technology and the twist balance covering yarn technology are combined, the cashmere covering yarn with an internal hollow structure is obtained, and the bulkiness and softness of pure cashmere knitwear are improved. The air content is increased through internal holes, and the bulkiness is improved. The torque problem of the high-twist yarn is solved, the stability of the yarn and the fabric is improved, and the machinability is improved. The hollow structure means that when better bulkiness and volume feeling are achieved, the actually consumed pure cashmere fiber amount is smaller than that of traditional solid cashmere yarn.

Description

Technical Field

[0001] The invention belongs to the field of textile technology, and particularly relates to a cashmere colored spun yarn with a gradient structure of fluffy inside and soft outside, a preparation method thereof, and a fabric. Background Art

[0002] Traditional pure cashmere sweaters tend to felt and become lumpy after washing, resulting in a harder feel and reduced resilience. To improve bulk, existing technologies often use chemical puffing or blending, but the former damages the strength of cashmere fibers, while the latter reduces the quality and value of pure cashmere. In recent years, although water-soluble fiber-assisted spinning technology has been applied, it still faces significant bottlenecks in the field of pure cashmere: high breakage rates and poor yarn uniformity due to differences in fiber properties during blending; the yarn structure becomes loose after water-soluble treatment, unable to form a stable hollow shape, but instead exacerbating pilling; and conventional core-spun yarn processes focus more on functional improvements, making it difficult to synergistically resolve the contradiction between the fluffiness and structural stability of pure cashmere yarn. Furthermore, while color-spun cashmere (dyeing cashmere fibers before spinning) can impart rich, soft, and layered colors to fabrics while avoiding damage to the suede surface during dyeing, thus increasing product value, it also faces significant challenges: the single fiber strength of dyed cashmere fibers is generally about 25% lower than that of ordinary, undyed white cashmere fibers, and elongation at break may also decrease. Therefore, an innovative process is urgently needed to improve the fabric's bulk, softness, and deformation resistance while maintaining the quality of the cashmere.

[0003] Patent CN 112442771 B describes a spinning process for blended yarns of water-soluble polyvinyl alcohol (PVA) fibers and high-count cashmere. The core of the process is to surface-modify the PVA fibers by optimizing the spinning process, aiming to address the problems of uneven fiber mixing during blending, uneven yarn evenness after washing to remove PVA, and loose fabric structure, thereby obtaining a high-count, evenly even cashmere fabric with good wearability. However, the process is extremely complex and demanding, resulting in difficult operation and high energy consumption; it relies on a variety of special auxiliaries and chemicals, and requires the use of UV radiation equipment, which significantly increases production costs; and it has strict requirements on raw materials, which limits its applicability. At the same time, the inclusion of chemicals such as ethylene glycol in the modifying liquid and the strict anti-water requirements also bring additional environmental pressures and production control challenges. For the application of this process to colored cashmere, the inherent disadvantage of fiber strength will further amplify the risk of breakage during the spinning process, making the production of high-count yarns more difficult.

[0004] Patent CN 101603223A proposes a cashmere and water-soluble vinylon blended yarn and its preparation method, aiming to address cashmere resource shortages and the poor spinnability of short fibers by replacing them with a low proportion of vinylon. The core process involves combing the cashmere and wool separately, then allowing them to sit for 24 hours before blending with the vinylon. The yarn is then combed and spun into a coarse knitting yarn, which is then knitted into a flat-knit sweater. Finishing involves washing the yarn at 60°C to dissolve the vinylon, reducing cashmere usage by 5-20%, improving bulk and hand feel, and ensuring that the finished product meets national first-class quality standards. However, this solution has significant drawbacks: the process description is brief, operability is limited, and industrial feasibility is low. If applied to color-spun cashmere, the loss of fiber strength caused by dyeing would exacerbate the poor spinnability of short fibers in the process, making it even more difficult to ensure yarn uniformity and strength.

[0005] Both of the above patents optimize the blending process of cashmere and water-soluble fibers, achieving a uniform blend of cashmere and water-soluble fibers. After washing to remove the water-soluble fibers, the yarns are uniform and the product has good wearability. However, these solutions have shortcomings in terms of structure, yarn feel, and production costs. Furthermore, these solutions fail to fully consider the core difficulties of color-spun cashmere fibers, such as poor spinnability, high breakage rates, and insufficient yarn strength, resulting from the significant reduction in strength (approximately 25%). This limits their potential application in color-spun cashmere products that pursue high added value and specific appearance effects. Summary of the Invention

[0006] The main technical problem solved by the present invention is to provide a method for preparing a torsion-balanced cashmere colored core-spun yarn and its fabric, which can significantly optimize the fluffiness and processing stability of the cashmere yarn through innovative processing technology and the original use of a reverse-twist core-spun yarn structure in conjunction with water-soluble fibers. In addition, by utilizing the high curling properties unique to PVA fibers, the present invention successfully spins cashmere / PVA core yarns with significantly reduced fineness. This not only effectively breaks through the technical bottleneck of pure cashmere fibers that are difficult to meet the demanding raw material quality and precision processes required for spinning ultrafine single yarns due to their smooth surface and insufficient cohesion, but also significantly reduces the technical threshold and cost pressure of ultrafine cashmere yarn production. In order to solve the above-mentioned technical problems, the present application provides the following technical solutions:

[0007] The present invention provides a method for preparing cashmere colored spun yarn with a gradient structure of fluffy inner and soft outer, comprising the following steps:

[0008] S11: preparing the water-soluble fiber into roving A through the steps of opening and cleaning, carding, drawing and roving;

[0009] S12: twisting and spinning the roving A to obtain a strongly twisted single yarn;

[0010] S13: Twist spinning is performed using the strong twist single yarn as the core yarn and the roving B as the covering yarn to obtain the cashmere colored spun yarn with the gradient structure of fluffy inside and soft outside; the roving B is prepared from cashmere through the steps of opening and cleaning, carding, drawing and roving; the twist spinning in step S12 and the twist spinning in step S13 have opposite twist directions, that is, one twist direction is Z twist and the other twist direction is S twist.

[0011] Preferably, in step S11, the water-soluble fiber and cashmere are prepared into roving A through the steps of opening and cleaning, carding, drawing and roving; and the mass ratio of the cashmere to the water-soluble fiber is 1-3:1.

[0012] Furthermore, the cashmere is dyed before use.

[0013] Preferably, in step S12, the twist during twist spinning is 1300-1450 T / M, and the linear density is 7.4-11.76 tex.

[0014] Preferably, in step S13, the twist of the double yarn during twist spinning is 80-415 T / M, and the density of the core-spun yarn is 23.81-34.48 tex.

[0015] Preferably, in the step S12, the twist spinning is performed using a spinning frame; and in the step S13, the twist spinning is performed using a ring spinning frame.

[0016] Preferably, the water-soluble fiber is polyvinyl alcohol fiber (PVA).

[0017] Specifically, the preparation method of the cashmere colored yarn with a gradient structure of fluffy inner and soft outer is as follows: Figure 1 As shown, the following steps are included:

[0018] Step 1: The dyed high-quality cashmere and water-soluble fiber are processed into roving through the blowroom, carding, drawing, and roving processes. In the carding process, the cashmere fiber and water-soluble fiber produced in the blowroom are fed through a feed plate and a feed roller, and the cashmere fiber and water-soluble fiber are transferred to the licker-in roller. The fibers are stripped by the card clothing on the cylinder adjacent to the licker-in roller. The cashmere fiber and water-soluble fiber are freely opened and sorted between the cylinder and the rear rotating flat plate, freely transferred and combed between the cylinder and the middle rotating flat plate, and finally mixed and combed between the cylinder and the front rotating flat plate. The cashmere fiber and water-soluble fiber are then stripped by the card clothing on the doffer to form a fiber web, which is then gathered into slivers through a bell mouth. After pressing and sorting, the card sliver is obtained, and then it is wound into sliver cans through the winding system.

[0019] Step 2: The roving is passed through a spinning machine to produce S(Z) high-twist single yarn; the roving produced in step 1 is further drafted, twisted, and wound to produce high-strength and high-uniformity yarn. First, the roving is evenly fed into the spinning machine, where the yarn is drafted by a drafting device to optimize the fiber arrangement. Then, the yarn is subjected to S(Z) high-twist treatment by controlling the twist. Finally, the spun yarn is wound into a bobbin by a winding device, and quality control is performed to ensure that the yarn uniformity, strength, and twist meet the standards. The entire process ensures high yarn quality by precisely controlling the process parameters, providing high-quality core material for the subsequent core-spun processing.

[0020] Step 3: The dyed high-quality cashmere is processed through the blowroom, carding, drawing, and roving processes to produce roving. In the carding process, the cashmere fibers produced in the blowroom are fed through a feed plate and feed rollers, transferring the cashmere fibers to the licker-in rollers. The cotton fibers are stripped by the card clothing on the cylinder adjacent to the licker-in rollers. The cashmere fibers are then free-opened and sorted between the cylinder and the rear rotating flats, free-transfer combed between the cylinder and the middle rotating flats, and finally combed between the cylinder and the front rotating flats. The cashmere fibers are then stripped by the card clothing on the doffer to form a fiber web, which is then gathered into slivers through a bell mouth. After pressing and sorting, the card sliver is obtained, which is then wound into cans by the winding system.

[0021] Step 4: Using the strongly twisted S(Z) single yarn from Step 2 as the core yarn and the roving from Step 3 as the covering yarn, a Z(S) twist process is performed on a ring spinning machine to produce a cashmere-dyed yarn with a gradient structure of inner fluffy and outer softness. In the core-spun process, the single yarn twisted in Step 2 is placed on a core-spun yarn device for core-spun yarn. The single yarn is fed through a feeding device, and the roving prepared in Step 3 is simultaneously wrapped around it. A counter-twist process ensures that the staple fibers are evenly wrapped around the core yarn. Because the S(Z) twist of the core yarn and the Z(S) twist of the outer covering fibers are opposite, the twist of the S(Z) twisted core yarn is reduced, and the inner S(Z) twist and outer Z(S) twist create a torsional stress balance. This not only ensures the overall structural stability of the core-spun yarn but also effectively improves the yarn's strength, softness, and deformation resistance, thereby enhancing the yarn's quality and performance.

[0022] The present invention also provides a cashmere colored spun yarn with a gradient structure of fluffy inside and soft outside, which is prepared by the above-mentioned preparation method.

[0023] The present invention also provides a pure cashmere double yarn knitted sweater, which is obtained by weaving the above-mentioned cashmere colored spun yarn with a gradient structure of fluffy inner and soft outer, followed by washing, and the specific steps are as follows:

[0024] Step 5: Weaving the twist-balanced cashmere colored core-spun yarn obtained in the above step 4 on a flat knitting machine to obtain a colored pure cashmere double-yarn knitted sweater;

[0025] Step 6: After the garment is washed, the water-soluble fibers in the core yarn are completely dissolved, and the yarn becomes hollow inside, with a loose inside and tight outside, making the whole garment fluffy and soft. Figure 2 shown.

[0026] Preferably, the water washing temperature is 50-70°C.

[0027] Preferably, the flat knitting machine is used to weave the fabric, and the resulting fabric structure is a plain weave with a fabric weight of 1.8-2.08 g / cm 2 .

[0028] The technical solution of the present invention has the following advantages over the prior art:

[0029] The method for preparing a twist-balanced cashmere colored core-spun yarn and fabric thereof proposed in the present invention has the following advantages:

[0030] 1) Unique "Hollow" Cashmere Yarn Structure: Combining water-soluble fiber and twist-balanced core-spun yarn technology, this creates a cashmere core-spun yarn with an internal hollow structure. This significantly enhances the fluffiness and softness of pure cashmere sweaters, achieving a level of comfort and luxury that surpasses conventional products.

[0031] 2) Excellent loft and workability: The holes within the yarn significantly increase the air content, which in turn significantly improves the loft of the fabric. The torsion balance design effectively overcomes the torque problem of high-twist yarns, improves the stability of the yarn and fabric, and produces fabrics without skew, improving workability.

[0032] 3) Reduced raw material costs and improved economic efficiency: The yarn's hollow structure means that while achieving the same or even superior fluffiness and volume, less pure cashmere fiber is actually consumed than with traditional solid cashmere yarn. Furthermore, leveraging the unique high crimping properties of PVA fibers, this invention successfully produces a cashmere / PVA core yarn with significantly reduced fineness. By utilizing relatively inexpensive water-soluble fibers as a temporary support, only the high-value cashmere remains in the final product, optimizing raw material costs and significantly reducing the technical barriers and cost pressures of ultrafine cashmere yarn production. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 A flow chart was prepared for the present invention.

[0034] Figure 2 Schematic diagram of yarn before and after washing.

[0035] Figure 3 These are the morphologies of the yarn prepared in Example 1, and pictures of the yarn before and after washing.

[0036] Figure 4 These are the morphologies of the yarn prepared in Example 2, and pictures of the yarn before and after washing.

[0037] Figure 5 These are the morphologies of the yarn prepared in Example 3, and pictures of the yarn before and after washing.

[0038] Figure 6 These are the morphology of the yarn prepared in Example 4, and pictures of the yarn before and after washing.

[0039] Figure 7 These are the morphology of the yarn prepared in Example 5, and pictures of the yarn before and after washing.

[0040] Figure 8 These are the morphology of the yarn prepared in Example 6, and pictures of the yarn before and after washing.

[0041] Figure 9 These are pictures showing that the fabric made from the yarn of Example 1 has no bias flake problem and the fabric made from ordinary single yarn has bias flake problem. DETAILED DESCRIPTION

[0042] The present invention will be further described below with reference to the accompanying drawings and specific embodiments so that those skilled in the art can better understand the present invention and implement it. However, the embodiments are not intended to limit the present invention.

[0043] Example 1:

[0044] Example 1 A method for preparing twist-balanced cashmere colored core-spun yarn and fabric thereof, the process steps are as follows:

[0045] S1: 62% dyed high-quality cashmere and 38% water-soluble fiber polyvinyl alcohol fiber (PVA) are processed into roving through the processes of opening and cleaning, carding, drawing and roving.

[0046] In the carding process, cashmere fibers and water-soluble fibers produced in the opening and cleaning process are fed through a feed plate and feed rollers, where they are transferred to the licker-in roller. The fibers are then stripped by the card clothing on the cylinder adjacent to the licker-in roller. The cashmere and water-soluble fibers undergo free opening and finishing between the cylinder and the rear rotating flat, free transfer carding between the cylinder and the middle rotating flat, and finally mixed carding between the cylinder and the front rotating flat. The cashmere and water-soluble fibers are then stripped by the card clothing on the doffer to form a fiber web. This is then gathered into slivers through a bell mouth, pressed and finished, and then wound into cans by the winding system. The S1 sliver basis weight is 18g / 5m; the cylinder speed is 260r / min; the licker-in speed is 650r / min; and the weight unevenness is reduced to less than 1.5%. The total drafting ratio in the roving process is 7.5; the drafting ratio in the back zone is 1.2; the twist coefficient is 90; the dry weight is 4g / 10m; the spindle speed is 800r / min; the twist of the roving is 44T / m; and the linear density is 4g / 10m.

[0047] S2: The roving is made into S-twisted strong twist single yarn through a spinning machine.

[0048] The roving from the roving process is further drafted, twisted, and wound to produce high-strength, uniform yarn. First, the roving is evenly fed into the spinning frame, where the sliver is drafted by the drafting device to optimize fiber alignment. The yarn is then subjected to S (Z) twisting by controlling twist. Finally, the spun yarn is wound into a bobbin by the winding device, where quality monitoring is performed to ensure that the yarn's uniformity, strength, and twist meet standards. Precise control of process parameters throughout the entire process ensures high yarn quality, providing high-quality core material for subsequent core-spun processing. The twist direction in the S2 spinning process is S twist; the twist is 1300 T / m; the total draft ratio is 35.7; the back-zone draft ratio is 1.2; the rotation speed is 11,700 rpm; the roller center distances are 20 mm and 35 mm, and the gauge width is 25 mm. The resulting S-twist strong-twist single yarn has a twist of 1300 T / m and a linear density of 11.76 tex.

[0049] S3: The dyed high-quality cashmere is made into roving through the processes of opening and cleaning, carding, drawing and roving.

[0050] In the carding process, cashmere fibers produced in the opening and cleaning process are fed through a feed plate and feed rollers, where they are transferred to the licker-in roller. The cotton fibers are then stripped by a card cloth on the cylinder adjacent to the licker-in roller. The cashmere fibers undergo free opening and finishing between the cylinder and the rear rotating flat plate, free transfer carding between the cylinder and the middle rotating flat plate, and finally carding between the cylinder and the front rotating flat plate. The cashmere fibers are then stripped by the card cloth on the doffer, forming a fiber web. This is then gathered into slivers through a bell mouth, pressed and finished, and then wound into cans by the winding system. The S3 medium roving sliver has a basis weight of 18g / 5m. The cylinder speed is 260 rpm, and the licker-in roller speed is 650 rpm. Weight unevenness is reduced to less than 1.5%. The total draft ratio in the roving process is 7.2; the draft ratio in the back zone is 1.2; the twist coefficient is 95; the dry weight is 4g / 10m; and the spindle speed is 600r / min.

[0051] S4: Using strong twisted single yarn as core yarn and coarse yarn as covering yarn, the yarn is placed on a ring spinning machine and subjected to Z twist process to produce cashmere colored yarn with a gradient structure of fluffy inside and soft outside.

[0052] In the core-spun process, the twisted single yarn is placed on the core-spun yarn device for core-spun yarn. The single yarn is fed through a feeding device, and the roving prepared in the roving process is simultaneously wrapped around the outer layer of the single yarn. Through the back-twist process, the staple fibers are evenly wrapped around the outer surface of the core yarn. The twist in the S4 process is 580 T / m; the total draft ratio is 31; the back zone draft ratio is 1.2; the spindle speed is 8700 r / min; the roller center distances are 20 mm and 35 mm respectively; the gauge block width is 30 mm; the core yarn twist is 1300 T / m, the outer yarn twist is 580 T / m, the double yarn twist is 80 T / m, and the core yarn density is 32.26 tex.

[0053] S5: The cashmere colored yarn with a gradient structure of fluffy inner and soft outer is woven on a flat knitting machine to obtain a colored pure cashmere double yarn knitted sweater, such as Figure 3 shown.

[0054] The weaving machine gauge in the manufacturing process is 12 needles, the fabric structure is plain weave, and the fabric weight is 2.08g / cm 2 .

[0055] S6: The garment is washed to completely dissolve the water-soluble fibers in the yarn core, leaving the yarn hollow inside and loose inside and tight outside, making the entire garment fluffy and soft. The washing temperature is 60°C.

[0056] Example 2:

[0057] The method of Example 2 is similar to that of Example 1, except that the following steps are performed:

[0058] S1: 62% dyed high-quality cashmere and 38% water-soluble fiber polyvinyl alcohol fiber (PVA) are processed into roving through the processes of opening and cleaning, carding, drawing and roving;

[0059] S2: The roving in S1 is made into S-twisted strong twist single yarn through a spinning machine;

[0060] S3: The dyed high-quality cashmere is processed into roving through the processes of opening and cleaning, carding, drawing and roving;

[0061] S4: Using the strong twisted single yarn as the core yarn and the coarse yarn in the S3 process as the covering yarn, the yarn is placed on the ring spinning frame and subjected to Z-twisting process to produce cashmere colored yarn with a gradient structure of inner fluffy and outer soft;

[0062] S5: The cashmere colored yarn with a gradient structure of fluffy inner and soft outer is woven on a flat knitting machine to obtain a colored pure cashmere double yarn knitted sweater, such as Figure 4 As shown;

[0063] S6: After the garment is washed, the water-soluble fibers in the yarn core are completely dissolved, and the yarn becomes hollow inside, loose inside and tight outside, making the whole garment fluffy and soft.

[0064] The S1 sliver has a basis weight of 18g / 5m; the cylinder speed is 260r / min; the licker-in speed is 650r / min; and the weight unevenness is reduced to less than 1.5%. The total draft ratio in the roving process is 7.5; the draft ratio in the backing zone is 1.2; the twist coefficient is 80; the dry basis weight is 4g / 10m; the spindle speed is 800r / min; the twist of the roving is 40T / m; and the linear density is 4g / 10m.

[0065] The twist of the spinning process in S2 is 1450 T / m; the total draft ratio is 40; the back zone draft ratio is 1.2; the rotation speed is 11600 r / min; the roller center distances are 20 mm and 35 mm respectively, and the gauge width is 25 mm; the twist of the produced S-twist high-twist single yarn is 1450 T / m and the linear density is 10.53 tex;

[0066] The S3 sliver has a basis weight of 18g / 5m; a cylinder speed of 260r / min; a licker-in speed of 650r / min; and a weight unevenness ratio of less than 1.5%. The total draft ratio in the roving process is 7.2; the draft ratio in the backing zone is 1.2; the twist coefficient is 95; the dry basis weight is 4g / 10m; and the spindle speed is 600r / min.

[0067] The S4 has a medium twist of 660 T / m; a total draft ratio of 31; a back zone draft ratio of 1.2; a spindle speed of 7250 r / min; roller center distances of 20 mm and 35 mm respectively; a gauge block width of 30 mm; the core yarn twist of the core yarn is 1450 T / m, the outer yarn twist is 660 T / m, the double yarn twist is 110 T / m, and the core yarn density is 27.78 tex;

[0068] The weaving gauge of S5 is 12 needles, the fabric structure is plain weave, and the fabric weight is 2.00g / cm 2 .

[0069] The water washing temperature in S6 is 60°C.

[0070] Example 3:

[0071] The difference between the method of Example 3 and Example 1 is as follows:

[0072] S1: 100% water-soluble fiber polyvinyl alcohol fiber (PVA) is processed into roving through the processes of opening and cleaning, carding, drawing and roving;

[0073] S2: The roving in S1 is made into Z-twisted strong-twisted single yarn through a spinning machine;

[0074] S3: The dyed high-quality cashmere is processed into roving through the processes of opening and cleaning, carding, drawing and roving;

[0075] S4: Using the strong twisted single yarn as the core yarn and the coarse yarn in the S3 process as the covering yarn, the yarn is placed on the ring spinning frame and subjected to S-twisting process to produce cashmere colored yarn with a gradient structure of fluffy inside and soft outside;

[0076] S5: The cashmere colored yarn with a gradient structure of fluffy inner and soft outer is woven on a flat knitting machine to obtain a colored pure cashmere double yarn knitted sweater, such as Figure 5 As shown;

[0077] S6: After the garment is washed, the water-soluble fibers in the yarn core are completely dissolved, and the yarn becomes hollow inside, loose inside and tight outside, making the whole garment fluffy and soft.

[0078] The S1 sliver has a basis weight of 18g / 5m, a cylinder speed of 300r / min, a licker-in speed of 750r / min, and a weight unevenness of less than 1.5%. The total draft ratio in the roving process is 8, the backing zone draft ratio is 1.2, the twist coefficient is 75, the dry basis weight is 3g / 10m, the spindle speed is 1000r / min, and the twist of the roving is 44T / m, with a linear density of 3g / 10m.

[0079] The twist in the S2 spinning process is 1350 T / m; the total draft ratio is 43; the back zone draft ratio is 1.2; the rotation speed is 12800 r / min; the roller center distances are 20 mm and 35 mm respectively, and the gauge width is 25 mm. The twist of the produced Z-twist high-twist single yarn is 1350 T / m and the linear density is 7.4 tex.

[0080] The S3 sliver has a basis weight of 18g / 5m; the cylinder speed is 180r / min; the licker-in speed is 400r / min; the weight unevenness is reduced to less than 1.5%. The total draft ratio in the roving process is 8.5; the draft ratio in the backing zone is 1.2; the twist coefficient is 95; the dry basis weight is 3.5g / 10m; and the spindle speed is 600r / min.

[0081] The S4 medium twist is 460T / m; the total draft ratio is 27.5; the back zone draft ratio is 1.2; the spindle speed is 6250r / min; the roller center distances are 20mm and 35mm respectively; the gauge width is 30mm;

[0082] The core yarn twist of the prepared core-spun yarn is 1350T / m, the outer yarn twist is 460T / m, the double yarn twist is 290T / m, and the core yarn density is 34.48tex;

[0083] The weaving gauge of S5 is 14 needles, the fabric structure is plain weave, and the fabric weight is 2.08g / cm 2 ;

[0084] The water washing temperature in S6 is 60°C.

[0085] Example 4:

[0086] The differences between Example 4 and Example 1 are as follows:

[0087] S1: 100% water-soluble fiber polyvinyl alcohol fiber (PVA) is processed into roving through the processes of opening and cleaning, carding, drawing and roving;

[0088] S2: The roving in S1 is made into Z-twisted strong-twisted single yarn through a spinning machine;

[0089] S3: The dyed high-quality cashmere is processed into roving through the processes of opening and cleaning, carding, drawing and roving;

[0090] S4: Using the strong twist single yarn as the core yarn and the roving prepared in S3 as the covering yarn, the yarns are placed on a ring spinning machine and subjected to an S-twist process to produce cashmere colored yarn with a gradient structure of inner fluffy and outer softness;

[0091] S5: The cashmere colored yarn with a gradient structure of fluffy inner and soft outer is woven on a flat knitting machine to obtain a colored pure cashmere double yarn knitted sweater, such as Figure 6 As shown;

[0092] S6: After the garment is washed, the water-soluble fibers in the yarn core are completely dissolved, and the yarn becomes hollow inside, loose inside and tight outside, making the whole garment fluffy and soft.

[0093] The S1 sliver has a basis weight of 18g / 5m, a cylinder speed of 300r / min, a licker-in speed of 750r / min, and a weight unevenness of less than 1.5%. The total draft ratio in the roving process is 8, the backing zone draft ratio is 1.2, the twist coefficient is 75, the dry basis weight is 3g / 10m, the spindle speed is 1000r / min, and the twist of the roving is 44T / m, with a linear density of 3g / 10m.

[0094] The twist in the S2 spinning process is 1350 T / m; the total draft ratio is 43; the back zone draft ratio is 1.2; the rotation speed is 12800 r / min; the roller center distances are 20mm and 35mm respectively, and the gauge width is 25mm; the twist of the produced Z-twist high-twist single yarn is 1350 T / m and the linear density is 7.4 tex;

[0095] The S3 sliver has a basis weight of 18g / 5m; a cylinder speed of 180r / min; a licker-in speed of 400r / min; and weight unevenness is reduced to less than 1.5%. The total draft ratio in the roving process is 8.5; the draft ratio in the backing zone is 1.2; the twist coefficient is 95; the dry basis weight is 3.5g / 10m; and the spindle speed is 600r / min.

[0096] The S4 spinning process uses the Siro spinning process with a twist of 500 T / m; the total draft ratio is 31; the back zone draft ratio is 1.2; the spindle speed is 6750 r / min; the roller center distances are 20 mm and 35 mm respectively; and the gauge width is 30 mm.

[0097] The core yarn twist of the prepared core-spun yarn is 1350T / m, the outer yarn twist is 500T / m, the double yarn twist is 315T / m, and the core yarn linear density is 31.25tex;

[0098] The weaving gauge of S5 is 16 needles, the fabric structure is plain weave, and the fabric weight is 2.00g / cm 2 .

[0099] The water washing temperature in step S6 is 60°C.

[0100] Example 5:

[0101] The differences between Example 5 and Example 1 are as follows:

[0102] S1: 100% water-soluble fiber polyvinyl alcohol fiber (PVA) is processed into roving through the processes of opening and cleaning, carding, drawing and roving;

[0103] S2: The roving in S1 is made into S-twisted strong twist single yarn through a spinning machine;

[0104] S3: The dyed high-quality cashmere is processed into roving through the processes of opening and cleaning, carding, drawing and roving;

[0105] S4: Using the strong twist single yarn as the core yarn and the roving prepared in S3 as the covering yarn, the yarns are placed on a ring spinning machine and subjected to an S-twist process to produce cashmere colored yarn with a gradient structure of inner fluffy and outer softness;

[0106] S5: The cashmere colored yarn with a gradient structure of fluffy inner and soft outer is woven on a flat knitting machine to obtain a colored pure cashmere double yarn knitted sweater, such as Figure 7 As shown;

[0107] S6: After the garment is washed, the water-soluble fibers in the yarn core are completely dissolved, and the yarn becomes hollow inside, loose inside and tight outside, making the whole garment fluffy and soft.

[0108] The S1 sliver has a basis weight of 18g / 5m, a cylinder speed of 300r / min, a licker-in speed of 750r / min, and a weight unevenness of less than 1.5%. The total draft ratio in the roving process is 8, the backing zone draft ratio is 1.2, the twist coefficient is 75, the dry basis weight is 3g / 10m, the spindle speed is 1000r / min, and the twist of the roving is 44T / m, with a linear density of 3g / 10m.

[0109] In the S2 spinning process, the twist direction is Z twist; the twist is 1350 T / m; the total draft is 43; the back zone draft is 1.2; the rotation speed is 12800 r / min; the roller center distances are 20 mm and 35 mm respectively, and the gauge width is 25 mm; the resulting S twisted single yarn has a twist of 1350 T / M and a linear density of 7.4 tex;

[0110] The S3 sliver has a basis weight of 18g / 5m; a cylinder speed of 180r / min; a licker-in speed of 400r / min; and weight unevenness is reduced to less than 1.5%. The total draft ratio in the roving process is 8.5; the draft ratio in the backing zone is 1.2; the twist coefficient is 95; the dry basis weight is 3.5g / 10m; and the spindle speed is 600r / min.

[0111] The S4 has an S twist direction and a twist of 520 T / m; a total draft ratio of 35.8; a back zone draft ratio of 1.2; a spindle speed of 7000 r / min; roller center distances of 20 mm and 35 mm respectively; and a gauge width of 30 mm.

[0112] The core yarn twist of the prepared core-spun yarn is 1350T / m, the outer yarn twist is 520T / m, the double yarn twist is 325T / m, and the core yarn density is 28.16tex;

[0113] The weaving gauge of S5 is 16 needles, the fabric structure is plain weave, and the fabric weight is 1.96g / cm 2 .

[0114] The water washing temperature in step S6 is 60°C.

[0115] Example 6:

[0116] The differences between Example 6 and Example 1 are as follows:

[0117] S1: 100% water-soluble fiber polyvinyl alcohol fiber (PVA) is processed into roving through the processes of opening and cleaning, carding, drawing and roving;

[0118] S2: The roving in S1 is made into S-twisted strong twist single yarn through a spinning machine;

[0119] S3: The dyed high-quality cashmere is processed into roving through the processes of opening and cleaning, carding, drawing and roving;

[0120] S4: Using the strong twist single yarn as the core yarn and the roving prepared in S3 as the covering yarn, the yarns are placed on a ring spinning machine and subjected to an S-twist process to produce cashmere colored yarn with a gradient structure of inner fluffy and outer softness;

[0121] S5: The cashmere colored yarn with a gradient structure of fluffy inner and soft outer is woven on a flat knitting machine to obtain a colored pure cashmere double yarn knitted sweater, such as Figure 8 As shown;

[0122] S6: After the garment is washed, the water-soluble fibers in the yarn core are completely dissolved, and the yarn becomes hollow inside, loose inside and tight outside, making the whole garment fluffy and soft.

[0123] The S1 sliver has a basis weight of 18g / 5m, a cylinder speed of 300r / min, a licker-in speed of 750r / min, and a weight unevenness of less than 1.5%. The total draft ratio in the roving process is 8, the backing zone draft ratio is 1.2, the twist coefficient is 75, the dry basis weight is 3g / 10m, the spindle speed is 1000r / min, and the twist of the roving is 44T / m, with a linear density of 3g / 10m.

[0124] In the S2 spinning process, the twist direction is Z twist; the twist is 1350 T / m; the total draft is 43; the back zone draft is 1.2; the rotation speed is 12800 r / min; the roller center distances are 20 mm and 35 mm respectively, and the gauge width is 25 mm; the resulting S twisted single yarn has a twist of 1350 T / m and a linear density of 7.4 tex;

[0125] The S3 sliver has a basis weight of 18g / 5m; a cylinder speed of 180r / min; a licker-in speed of 400r / min; and weight unevenness is reduced to less than 1.5%. The total draft ratio in the roving process is 8.5; the draft ratio in the backing zone is 1.2; the twist coefficient is 95; the dry basis weight is 3.5g / 10m; and the spindle speed is 600r / min.

[0126] The S4 twist direction is S twist; the twist is 680 T / m; the total draft ratio is 45.2; the back zone draft ratio is 1.2; the spindle speed is 7500 r / min; the roller center distances are 20 mm and 35 mm respectively; the gauge block width is 30 mm; the core yarn twist of the core yarn is 1350 T / m, the outer yarn twist is 680 T / m, the double yarn twist is 415 T / m, and the core yarn density is 23.81 tex;

[0127] The weaving gauge of S5 is 16 needles, the fabric structure is plain weave, and the fabric weight is 1.8g / cm 2 .

[0128] The water washing temperature in step S6 is 60°C.

[0129] Effect evaluation:

[0130] The present invention achieves a double breakthrough in the fluffiness and stability of cashmere yarn by innovatively adopting a reverse-twist core-spun yarn structure and synergistic effect with water-soluble PVA fiber.

[0131] Specifically: With high twist and fineness PVA / cashmere blended yarn as the core layer (S / Z twist), the outer layer is covered with low twist pure cashmere roving and applied with reverse twist (Z / S twist), and a "twist balance" structure is formed by offsetting the torque in the two twist directions, which completely solves the problem of curling deformation of ordinary single yarn, such as Figure 9 As shown in FIG, the fabric prepared by the patented yarn has no problem of skew flakes. Figures 2 to 8 As shown, the fabric after washing has obvious pores, and the core layer forms a continuous hollow channel, which significantly improves the air retention capacity. The outer cashmere remains loose due to the low twist process, and finally constructs a "fluffy inside and soft outside" gradient structure.

[0132] The present invention overcomes the bottleneck that pure cashmere fiber is difficult to spin into ultrafine core yarn due to its smooth surface and weak cohesion. At the same time, PVA is used to reduce the amount of cashmere used, while giving the fabric extraordinary fluffiness and soft touch, and achieving both raw material cost-effectiveness and processing stability.

[0133] Obviously, the above embodiments are merely examples for clarity of explanation and are not intended to limit the implementation methods. Those skilled in the art will appreciate that other variations or modifications can be made based on the above description. It is not necessary and impossible to enumerate all implementation methods here. Obvious variations or modifications arising therefrom remain within the scope of protection of the present invention.

Claims

1. A method for preparing cashmere colored yarn with a gradient structure of fluffy inner and soft outer, characterized in that: The steps include: S11: preparing the water-soluble fiber into roving A through the steps of opening and cleaning, carding, drawing and roving; S12: twisting and spinning the roving A to obtain a strongly twisted single yarn; S13: Twist spinning is performed using the strong twist single yarn as the core yarn and the roving B as the covering yarn to obtain the cashmere colored spun yarn with the gradient structure of fluffy inside and soft outside; the roving B is prepared from cashmere through the steps of opening and cleaning, carding, drawing and roving; the twist spinning in step S12 and the twist spinning in step S13 have opposite twist directions.

2. The preparation method according to claim 1, wherein In the step S11, water-soluble fiber and cashmere are prepared into roving A through the steps of opening and cleaning, carding, drawing and roving; the mass ratio of cashmere to water-soluble fiber is 1-3:

1.

3. The preparation method according to claim 1, wherein The cashmere is dyed before use.

4. The preparation method according to claim 1, wherein In step S12, the twist during twist spinning is 1300-1450 T / M and the linear density is 7.4-11.76 tex.

5. The preparation method according to claim 1, wherein In the step S13, the twist of the double yarn during twist spinning is 80-415 T / M, and the density of the core-spun yarn is 23.81-34.48 tex.

6. The preparation method according to claim 1, wherein In the step S12, the twist spinning is performed using a spinning frame; in the step S13, the twist spinning is performed using a ring spinning frame.

7. The preparation method according to claim 1, wherein The water-soluble fiber is polyvinyl alcohol fiber.

8. A cashmere colored yarn with a gradient structure of fluffy inside and soft outside prepared by the preparation method according to any one of claims 1 to 7.

9. A pure cashmere double yarn knitted sweater, characterized in that: The pure cashmere double yarn knitted sweater is obtained by weaving and then washing the cashmere colored spun yarn with a gradient structure of fluffy inside and soft outside as described in claim 8.

10. The pure cashmere double yarn knitted sweater according to claim 9, characterized in that: The water washing temperature is 50-70°C.

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